Hydraulic master brake cylinder control



Feb. y8, 1938. c. E. FlsETTE 2,107,565

HYDRAULIC EASTER BRAKE CYLINDER CONTROL Filed Oct. 28. 1936 M INvENToR4)/5 7" 24 l; L5 im CHARLES E.F|ssr1's Patented Feb. 8, 1938 PATENToFFlci-z 1 HYDRAULIC MASTER BRAKE CYLINDER CONTROL Charles E. Fisette,Los Angeles, Calif.

Application October 28, 1936, Serial No. 108,031

2 Claims.

An object of this invention is to provide a brakeA cylinder controlplaced between the rear end of an automobile and a trailer to soregulate. the brakes on the trailer without any strain whatsoever uponthe brakes of the automobile.

Another object' is to provide a device which shall be of simpleconstruction and therefore of inexpensive manufacture, and yet whichwill prove thoroughly practical and emcient in use.

l0 Another object of the invention is that the device is so constructedand arranged to operate brakes of a trailing vehicle, giving the properamount of pressure at the required time and will operate as theautomobile slows up or stops.

This invention may have a variety of applications and certain of thefeatures of construction may be embodied in a variety of structures.

Other objects, advantages and vfeatures of invention may appear from theaccompanying drawing, the subjoined detailed description and theappended claims.

'I'he accompanying drawing illustrates the invention.v

Figure 1 is a fragmental side elevation of a 5 trailer and automobileshowing how the invention is applied to the trailer frame tongue andshows diagrammatically the method of connecting the invention to themaster brake cylinder which is also shown. wf Fig. 2 is an enlargedfragmental horizontal section through the trailer tongue showing theinvention partly in section 'with a fragment ofthe master cylinder fixedthereto and methodof fixing the master plunger body to the trailertongue. g5 Fig. 3 is a view analogous to Fig. 2 showing the masterplunger in a retarded position and omitting fragments of the mastercylinder and trailer tongue. Fig. 4 is a section on the line 4--4 ofFigure 3. lo Fig. 5 is a section on the line 5 5 of Figure 3. Thereference numeral I designates the front end of a trailer I and 2therear end of an automobile and only such portion thereof illustrated,

as required to locate the device of my invention. The frame t andtrailer tongue il of the trailer i are, or may be of any approvedconstruction.

The master plunger body 5 is so constructed and arranged to iit snuglyin the tongue land 5o houses the master plunger 6 which is slidablymounted therein.

The master plunger body 5 is provided at one end with an internallythreaded bore 1 that per- .mits the spring adjusting nut 8 to bethreaded therein to permit adjustment of the tension Qi the movement ofmaster plunger Iii and to govern' the necessary stroke of the plunger inthe master cylinder I2 for the best adjustment ofA different weighttrailers. f; A friction washer 9 rests against .the adjusting 5' nut 8and is held in place by a tension spring lo that is guided by a springcup II thatiitsfsmigly at the bottom of the bore 1.

A master cylinder I2 is shown held in 'positionY by bolts la to themaster plungerv body' sand is. mf

provided with a unit M that extends into thelg internally threaded boreI to provide 'a bearing guide forv the master cylinder connecting rod I5that is provided with an adjustingnut I6 forA the connecting pin I1 thatcontacts'l the end of 15" the master plunger 6 so that wheneverthemaster yplunger B is moved forward or backward it op L.

erates the master cylinder I2 to apply or release the brakes not shownofthe trailer I through the une 2a.

The spring adjusting nut 8 is provided with a Y, 'I bore I8 that formsva guide for the adjusting nut I6.

The connecting pin I1 is threaded as at Ila .y into the adjusting' nutI6 to compensate for wear 25 for the life of the device. l

A shut off valve I9 is provided in the uid line I2a at the back of themaster cylinder I2 to nullify the brake action on the trailer I if sodesired. i

The plunger 6 is provided with a tapered shoulder 20 that abuts againstthe master plunger body 5 as shown in Figs. 2 and 3 of the drawing and areduced portion 2 I forms a link to connect the plunger to theautomobile 2 as shown, at the 35 connection 22 in'Fig. lvof the drawing.

To permit a smooth sliding t at all times of the plunger B in the mastercylinder plunger body 5 a grease tap 23 is provided.

Bolts 24 are provided to hold the master plung- 40 trailer comprising aplunger body; a plunger slid- 5o ably mounted in said plunger bodyadapted to apply brakes on the trailer; an internally threaded boreprovided at one end of said plunger body; a spring adjusting nut mountedin said threaded bore; -a friction washer resting 55 against saidadjusting nut; a spring cunslidably mounted at the bottom of saidinternally threaded bore to art as a guide fora tension spring which isinterposed between said friction Washer and said spring cup that absorbsany shek through vthe plunger; means slidably mounted in said internallythreaded bore iconnecting said plunger so that whenfgfsaid plunger isactuated Yit causes the brakes of the trailer to operate. Y f

i 2.Y A device of the charaoter set forth :adapted to be plaed between atowing vehicle and a trailer comprising a plunger body; a plungerVY2,107,565 i slidably mountedin said/plunger body adapted toapplyibrakesoin the trailer; said plunger being provided at one end witha tapered shoulder that abuts against said plunger body; ariV internallythreaded bore provided at one end of said plunger body; a'grease tap insaid plunger body that provides means of asmooth sliding t at all timesof said plunger andmeans slidably mounted in said internally threadedbore connecting said plunger so that when said plunger is'actuated it1'0 causes the brakes of the'trailer to operate.

f CHARLES E. FISTI'E.

